It's not present in Server 2003 Enterprise JD, and probably also not in Small Business Server 2003 on which Windows Home Server is based.
Checking around in it, the closest I get to system restore is ASR
Generally I think Server OS systems rely on full system backups or RAID configurations which auto provide full system backups
"The great majority of mankind are satisfied with appearances, as though they were realities, and are often more influenced by the things that seem than by those that are." - Niccolo Machiavelli